Protection film having base layer over adhesive layer
A protection film for an electronic device includes an adhesive layer including a first surface to which an electronic device is attached, and a film layer which contacts a second surface of the adhesive layer and includes at least one member, where a thickness of the adhesive layer satisfies Inequality 1: z ≤(5.1 x +57.4)·ln( y )−(14.7 x +140.5), where z is the thickness of the adhesive layer in terms of micrometers, x is a modulus of a member of the film layer which directly contacts the adhesive layer in terms of gigapascals, and y is a total thickness of the film layer in terms of micrometers.
1. A display device comprising:
a substrate;
a light emitting layer on the substrate;
an encapsulation layer on the light emitting layer;
a touch sensing layer on the encapsulation layer;
a cover window on the touch sensing layer; and
a protection film on the cover window,
wherein the protection film includes a base layer and an adhesive layer on the base layer,
the adhesive is disposed between the cover window and the base layer,
the base layer has a modulus of about 2 gigapascals to about 9 gigapascals,
the base layer has a thickness of about 25 micrometers to 75 micrometers,
the adhesive layer has a modulus of about 10 megapascals or less at a temperature of −20 degrees Celsius or lower, and
the adhesive layer has a thickness of 100 micrometers or more.
2. The display device of claim 1 , wherein the adhesive layer comprises an acrylic-based adhesive.
3. The display device of claim 1 , wherein the encapsulation layer comprises a thin film including an inorganic material and a thin film including an organic material.
4. The display device of claim 1 , wherein the encapsulation layer comprises:
a first inorganic layer on the touch sensing layer;
an organic layer on first inorganic layer; and
a second inorganic layer on the organic layer.
5. The display device of claim 1 , wherein the thickness of the adhesive layer satisfies Inequality (1):
z
≤
(
5.1
x
+
57.4
)
·
ln
(
y
)
-
(
14.7
x
+
140.5
)
,
(
1
)
where z is the thickness of the adhesive layer in terms of micrometers and equal to or greater than 100 micrometers, x is a modulus of the base layer in terms of gigapascals, and y is a total thickness of the protection film layer in terms of micrometers,
(5.1x+57.4)·ln(y)−(14.7x+140.5) is greater than zero, and
a temperature is about −40° C. to about 65° C.
6. A display device comprising:
a substrate;
a light emitting layer on the substrate;
an encapsulation layer on the light emitting layer;
a touch sensing layer on the encapsulation layer;
a cover window on the touch sensing layer; and
a protection film on the cover window,
wherein the protection film comprises a base layer, a hard-coating layer on a first surface of the base layer, and an adhesive layer on a second surface of the base layer, the second surface facing the cover window,
the base layer has a modulus of about 2 gigapascals to about 9 gigapascals,
the base layer has a thickness of about 25 micrometers to 75 micrometers,
the adhesive layer has a modulus of about 10 megapascals or less at a temperature of −20 degrees Celsius or lower, and
the adhesive layer has a thickness of 100 micrometers or more.
7. The display device of claim 6 , wherein the hard-coating layer comprises an organic layer.
8. The display device of claim 7 , wherein the organic layer includes an acrylate-based compound.
9. The display device of claim 7 , further comprising an organic-inorganic composite layer.
10. The display device of claim 6 , wherein the thickness of the adhesive layer satisfies Inequality (2):
z
≤
(
5.1
x
+
57.4
)
·
ln
(
y
)
-
(
14.7
x
+
140
.5
)
,
(
2
)
where z is the thickness of the adhesive layer in terms of micrometers and equal to or greater than 100 micrometers, x is a modulus of the base layer in terms of gigapascals, and y is a total thickness of the protection film layer in terms of micrometers,
(5.1x+57.4)·ln(y)−(14.7x+140.5) is greater than zero, and
a temperature is about −40° C. to about 65° C.
11. A display device comprising:
a display panel;
a window on the display panel; and
a protection film layer on the window,
wherein the protection film comprises a base layer, a first functional layer on a first surface of the base layer, and an adhesive layer on a second surface of the base layer, the second surface facing the window,
wherein a thickness of the adhesive layer satisfies Inequality (3):
z
≤
(
5.1
x
+
57.4
)
·
ln
(
y
)
-
(
14.7
x
+
140
.5
)
,
(
3
)
where z is the thickness of the adhesive layer in terms of micrometers, x is a modulus of the base layer in terms of gigapascals, and y is a total thickness of the protection film layer in terms of micrometers,
(5.1x+57.4)·ln(y)−(14.7x+140.5) is greater than zero, and
a temperature is about −40° C. to about 65° C.,
the thickness of the adhesive layer is about 25 micrometers or more, and
the protection film further comprises a second functional layer on the first functional layer.
12. The display device of claim 11 , wherein the first functional layer comprises an organic layer including an acrylate-based compound.
13. The display device of claim 12 , wherein the first functional layer further comprises an organic-inorganic composite layer.
14. The display device of claim 11 , wherein the first functional layer is a hard-coating layer and the second functional layer is an anti-fingerprint coating layer.
15. The display device of claim 11 , wherein the protection film further comprises a third functional layer, which is a self-restoring layer, on the second functional layer.